Colloid adhesion reduction

The hydrosilylation reaction, leading to the formation of an alkylsilane by addition of a hydrosilane unit (Si-H) to a double bond, is widely used in the production of silicon polymers, paper release coatings and pressure-sensitive adhesives. Many homogeneous organometalhc complexes based on Co, Ni, Pd, Rh or Pt have been used to catalyze this reaction, but strong evidence has proved that the really active species were metal colloids [95-97]. Moreover, it has been demonstrated that Pt colloids were the most effective catalysts for SiH addition to terminal olefins (98). However, Lewis et al. [99] have reported Rh colloids-catalyzed hydrosilylation (Scheme 11.16). The particles were prepared by the reduction of rhodium chloride by the silane reagents. The authors have shown that Rh colloids present an interesting activity in the addition of di- and trihydrides to olefins, compared to platinum colloids. 

Chemical reduction is the most frequently applied method for the preparation of silver nanoparticles as stable, colloidal dispersions in water or organic solvents. However, a number of alternative green chemistry synthesis routes have been reported. Inspired by mussel adhesive proteins, a novel functional polyurethane based on hydrolyzable tannins that contain a number of catechol groups was... 

Yuan J, Chen L, Jiang X, Shen J, Lin S. Chemical graft polymerization of sulfobetaine monomer on polynrethane surface for reduction in platelet adhesion. Colloids Surf B Biointerfaces 2004 39(l-2) 87-94. 

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